Octavia Mk1 1.6 BFQ Gearbox upgrade.

Hi guys. I don't know if someone has done it or if it was talked before, but i want to upgrade my gearbox. I have a 1.6 SR BFQ with some modifications. 162HP after boosting it. The problem is that after a couple of launch controls and such, managed to brake my gearbox, mainly my differential (EMU BLACK, Launch control at 4000rpm). Wanted to know if there is a way bolt on some kind of gearbox that is more durable. Diesel gearbox or 1.8t or such. Want to keep the 5 speed, don't need the 6 speed. If i were to put on a 1.8T or 1.9 gearbox, what would be necessary to change or is the bolt pattern even the same or the clutch (dont really have a problem with the 1.6 clutch, it holds up really good).